SU590866A2 - Device for automatic selection of facsimile receiver speed - Google Patents

Description

one

The invention relates to facsimile technology, namely to automatic control devices by facsimile receivers.

According to the main author. St. No. 418988, a device for automatically selecting a speed of a receiving facsimile apparatus, comprising in series an integrating, threshold and shaping device, a time relay, which is connected to a control unit consisting of a counter, a decryftor, executive relay keys and executive relays via the output of the forming device is connected to one of the inputs of the coincidence circuits directly, and to the others through a trigger and the corresponding reference pulse generators, the second input They are connected to the output of an additional time relay, one of the inputs of which is connected to the trigger output, and the other to the time relay output, while the outputs of the coincidence circuit are connected to an adder, the output of which is connected to the inputs of the account start key and the time relay.

However, the known device is not sufficiently high noise immunity.

The purpose of the invention is to improve the noise immunity of the device for automatic selection of the speed of a receiving fax machine.

To do this, an additional key, an additional trigger, and a definition block are entered into the device for automatic selection of the receiving fax speed.

end of the facsimile transmission, the output of the shaping device being connected to one of the trigger inputs via an additional key, the control input of which is connected to the output of the additional trigger, one of the inputs of which is connected to the output of the time relay, and the other input is connected to the input integrating device.

The drawing shows the structural electrical circuit of the device for automatic selection of the speed of the receiving facsimile device.

The proposed device contains integrating 1, threshold 2 and forming 3 devices, additional key 4, additional trigger 5, block 6 determining the end of facsimile transmission, trigger 7,

additional time relay 8, generator 9 reference pulses, coincidence circuit 10, adder 11, counting key 12, time relay 13 and control unit 14 consisting of counter 15, decryptor 16, keys 17 of executive relays and executive relays 18.

Integrating 1, threshold 2 and forming 3 devices are connected in series. The time relay 13 is connected to the control unit 14 via the start switch 12. The output of the shaping device 3 is connected directly to one input of the circuits 10, and to the others through a series-connected additional key 4, trigger 7 and the corresponding generators 9 reference pulses, the second inputs of which are connected to the output of the additional time relay 8, one of the inputs of which is connected to the trigger output 7, and the other to the output of the relay 13 time. The outputs of the matching circuit 10 are connected to an adder 11, the output of which is connected to the inputs of the start switch 12 and the time relay 13. The control input of the additional key 4 is connected to the output of the additional trigger 5, one of the inputs of which is connected to the output of the time relay 13, and the other input is connected to the input of the integrating device 1 via the block 6 for determining the end of the facsimile transmission.

The proposed device operates as follows.

The first impulse comes from the shaping device 3 to one of the inputs of the matching circuit 10 and simultaneously triggers the trigger 7, which triggers an additional time relay 8 and the generators 9 reference pulses. Each generator 9 generates a sequence of reference pulses in-phase with the transmitter's phase pulses for the i-th speed (, 2, ...,). These pulse sequences are fed to the other inputs of the matching circuit 10. In the latter, the periods following the reference pulses from the generators 9 are compared with the phase pulses of the transmitter, starting from the second. Matching schemes 10, in which the transmitter's phase pulses coincide in time with the reference pulses of the generators 9, pulses through the adder AND to the time relay 13, which opens the counting key 12 and enables the transmitter's phase pulses to pass to the counter 15. Depending on the number received counter input 15

pulses at the corresponding output of the decoder 16, a signal is transmitted through the corresponding switch 17 and activating the corresponding executive relay 18.

An additional time relay 8, in the event of a false pulse, triggers the trigger 7 and the generators 9 of the reference pulses triggered by this pulse. .

In case of switching on the time relay 13 from the true phase pulse of the transmitter, the additional time relay 8 is blocked in the on state and remains there until the end of the time relay 13 operation, after which it turns off, sets the trigger 7 and the generator 9 reference pulses to the initial state, simultaneously the signal from the time relay 13, an additional trigger 5 overturns, which locks the additional key 4, which is open in its initial state. In this case, triggering of the trigger 7 by interfering impulses from the output of the shaping device 3 during the entire time of the fax transmission is excluded. Upon the completion of the transmission of the facsimile message, the block 6 of determining the end of the facsimile transmission generates a pulse, which overturns the additional trigger 5 and opens the additional key 4.

Claims (1)

Invention Formula Device for automatic selection of the speed of a receiving fax machine according to the author. St. No. 418988, characterized in that, in order to increase noise immunity, an additional key, an additional trigger and a facsimile transmission determination unit are entered into it, the output of the forming device is connected to one of the trigger inputs via an additional key, the control input of which is connected to the output additional trigger, one of the inputs of which is connected to the output of the time relay, and the other input is connected to the input of the integrating device through the facsimile transmission determination unit